Re: tyrannosaurs and sauropods

["Timothy Williams" <twilliams_alpha@hotmail.com>]

Dinogeorge wrote:
> Sonorasaurus is named. Or is there still another one?

I had _Sonorasaurus_ down as a brachiosaur (basal titanosauriform).   
_Pleurocoelus_ looks like it might be a true titanosaur, based on Salgado et 
al. (1997).  If _Sonorasaurus_ is a close relative of _Pleurocoelus_ (not 
really discussed by Ratkevich), then it's a third.

The titanosaur I had in mind is from Utah, and has yet to be described - 
just mentioned at a recent SVP (Britt et al., 1997).  Abstract mentions 
strongly procoelous proximal caudals (other caudals moderately procoelous), 
nonbifid cervical spines, dorsals with high neural arches and short spines.  
The material includes a braincase!


References

Britt, B.B., Stadtman, K.L., Scheetz, R.D., and McIntosh, J.S.(1997)  
Camarasaurid and titanosaurid sauropods from the Early Cretaceous Dalton 
Wells Quarry (Cedar Mountain Formation), Utah.   J. Vert. Pal. 17 Supp: 34A.

Ratkevich, R. (1998).  New Cretaceous brachiosaurid dinosaur, Sonorasaurus 
thompsoni, gen. et sp. nov., from Arizona.  J. Arizona-Nevada Acad. Sci. 31: 
71-82.

Salgado, L., Coria, R.A. and Calvo, J.O. Salgado, L., Coria, R.A. and Calvo, 
J.O. (1997).  Evolution of titanosaurid sauropods. II: the cranial evidence. 
 Ameghiniana 34(1):32+.


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